Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b188c3f192b8d7afa8a91a8c144376abcb44cdd59d136de4cd043acc4cd5c01c' 
  AND token = '8pSpqqnpB7RCtVgOf7+TYooRjuPWsOCOWAatJ0AptE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}